Expansion-regulator for refrigerating-machines.



PATENTED FEB. 18, 1908.

O. E. LEVILLY.

EXPANSION REGULATOR FOR REPRIGERAIING MACHINES.

APPLICATION FILED FEB. 5, 1907:

UNITED STATES PATENT onrron.

O-LIVIER EMILE LEVILLY, OF PARIS, FRANCE.

EXPANSION-REGULATOR FOR REFRIGERATING-MAGHINES.

Specification of Letters Patent.

Patented Feb. 18, 1908;

Application filed February 6. 1907. Serial No. 355.949.

tion.

The present invention relates to refrigerating machines in which the cold is obtained through vaporization or through the expansion of a liquefied gas such as carbonic acid, ammonia etc.

It is evident that when the compressor destined to form the cycle through the reliquefication of the evaporated gas works with absolute regularity nothing is more simple than to regulate once for all the supply of liquefied gas in such a manner that it exactly corresponds with the suction of the compressor', which in its turn will -be regulated according to the degree of cold to be obtained. With the plants in refrigerating wagons however, where the compressor is operated from the axle ofthe car, an apparatus has to be provided which maintains the supply of liquefied gas automatically in proportion with the speed of the compressor and further with the degree of cold to be produced for maintaining a constant temperature in the wagon; because, when the cold should become too strong the liquefied gas would not evaporate quickly enough in the expander and liquid would be drawn into the compress or.

ample inthe accompanying drawing, in which Figure 1 represents the complete device in I section. Fig. 2 is an end view of the driving shaft.

The driving shaft a of the a paratus is connected with the compressor-s aft in such a manner that it revolves with the same. A

centrifugal governor?) is mounted upon the driving shaft, the fixed end of the governor consisting of the sleeve 0 and the movable end of the same consisting of sleeve (1; this latter sleeve is provided with a stepped cam 6 (Fig. 2) which has been obtained through juxtaposition of a certain number of similar earns the eccentricity of which gradually increases with their distance from the balls I); A spring f inclosed between the sleeve cl and a regulating screw- 9 permits. to adjust the effective working'of regulator b in such a manner that it corresponds with a predetermined speed of shaft a.

it represents the coupling which connects the apparatus with the reservoir for the liquefied gas and i represents the coupling which connects the apparatus with the expansionradiator. The object to be attained is to regulate the supply of liquefied gas, which passes through coup g .i in proportion with the speed of the compressor and with the temperature of the refrigerating chamber. With this object in view a movable recessed rod, which on the one hand is operated from the regulator and on the other hand through a thermometer of suitable construction, is substituted for the pointed screw usually arranged between the coupling h and 'i. This rod is composed of three parts,-one of which, la, is situated in the apparatusin contact with the liquefied gas and it is destined to regulate through its displacements the variations of the opening for the passage of the gas, which is made in the bottom of chamber m; the

middle part, n, serves for transmitting the regulating action of the thermometer, and

the third part, 0, of the rod serves for connecting the two first parts with the stepped cam e.

The part 7c of the rod is exposed to the pressure of the liquefied gas which forces it upwards and assures the complete obturation of the opening by means of the elastic washer p as long as there is no pressure exerted upon said rod in opposite direction. This obturation issecured through spring g which acts upon the abutment r of rod k.

The tightness of chamber m is secured through two screw-stoppers s & t which securely fixbetween them an elastic washer 'u.

Rod 0 terminates at its upper end in a roller 3) which bears against the sleeve (1 in such a manner that at each revolution of shaft a one of the ste s of cam e presses upon said roller and ma es the same descend. This motion is transmitted to rod is through rod n and effects the opening of the passage in the bottom of chamber m; each action of cam 6 will therefore cause a motion of rod is whereby communication between the coup-' ling h & i, is effected. This rod 70 has at the part which moves in the passage or channel in the bottom of chamber m, two wedgesha ed incisions w which are very narrow at the ower end where the washer p is provided but get larger towards the upper end. It is easy to understand that the quicker the compressor runs, the centrifugal governor b will pull the sleeve (1 farther to the left and conthe temperature of the refrigerating chamber, there is arranged between the parts n and 0 of the rod a stepped slide as which is hinged to a rack z and adapted to be displaced between two lateral guides 2 fixed to a yoke 3 of the chamber m. Therack z is moved through a sector 4 which is operated in the well known manner through a thera larger quantity of liquefied gas has to be -mometer of suitable construction.

The device is arranged in such a manner that when supplied'to the radiator the part of the slide which is placed between the parts 0 and n of therod becomes the thicker.

To facilitate the regulation of the displacementsof rod 0, k the part 0 is composed of two parts which are connected through a doublethreaded sleeve 5 for modifying the length of said rod; a spring 6 serves for securing the contact between roller 12 and sleeve (1. The yoke 3 serves further as support for guide 7 of rod 0.

What I claim as my invention and desire to secure by Letters Patent, is

An expansion regulator for refrigerating machines comprising in combination a valverod rovided with side inclined recesses made in t ree separate parts,the driving shaft for the device which 1s influenced from the compressor, a centrifugal governor on the driving shaft comprising a movable sleeve having a stepped cam formed thereon, adapted to act upon the upper part of the valve-- rod; a stepped slide inserted between the upper part and the middle art of the valverod, a device influenced t ough the thermometer of the cooling room connected with the stepped slide for displacing the same in horizontal direction, and a spiral spring around the lower part of the valve-rod forkeeping said 'part in the position in which it closes the passage for the liquefied gas, sub- A stantially as described and shown and for the purpose set forth.

In testimony whereof I have hereunto set,

my hand in presence of two subscribingwitnesses.

OLIVIER EMILE LEVILLY. Witnesses:

HANSON 0. 00x12, ALFRED FREY. 

